The sweating is usually caused by the hot food during meals, as well as chewing hard and other actions to promote the metabolism of sweat glands to speed up the secretion of sweat, which is usually a normal phenomenon. But if also accompanied by other uncomfortable symptoms, such as drinking, urination, weakness, palpitations, etc., may also be seen in the following pathological conditions: 1, diabetes: some diabetic patients sympathetic nerve damage, can appear a meal on the phenomenon of sweating, sometimes can also appear when waking up sweating, usually belong to the performance of sympathetic nerve control. It is usually accompanied by symptoms such as polyphagia, polydipsia, polyuria, etc. Fasting glucose can be checked to help confirm the diagnosis; 2, hyperthyroidism: it often causes increased excitability and hyper-metabolism of multiple systems, and can also appear to sweat when eating. It often causes weakness, lethargy, fatigue, night sweats, and low fever in the afternoon, and sweating during meals or other physical activities. In addition, pheochromocytoma, rickets or the use of certain drugs such as propranolol, maurozine, etc. may also cause sweating, can be checked to help confirm the diagnosis.